Acting
Calvin Choi Yat-Chi
January 3 1965- Place of birth: Hong Kong, British Crown Colony
- Gender: Male
- Also known as: Calvin Choy, Sir One One
Eldest among the 3 Grasshopper members. He has always been regarded as the most creative one and is also producer for various Hong Kong artists. Grasshopper is still active in the music industry, especially performing in concerts.
